Right now we'll take you to a new alternative to protecting yourself from pesky mosquitoes this summer. If you're worried about deet, that new type of repellant that claims to save you from those itchy bites without using the potentially harmful chemical and our Becky Worley put it to the test. Reporter: Summer, sun, Skeeters, the fight against biting bugs has often meant spraying yourself with chemical, specifically deet. People have been using deet for years and the reason why they use it is because it works. Reporter: In a recent "Consumer reports" article they wore which about sprays with more than 30% deet. You want to look for products that contain 15% to 30% deet. Reporter: They offer up another type, a synthetic compound called picaridin. Its active ingredient is related to molecules found in plants of the pepper family. Reporter: To see how the different repellants work, Scott Caroll, an and to mol gist at the university of california-davis prepares a mosquito box for me. Okay, I'm going in. First I put my arm in the box with mosquitoes who haven't eaten in 18 hours and I'm wearing no repellant. 19, 20, ten seconds. Can I stop. Over 30 mosquitoes landed on me. Next Dr. Caroll puts a deet spray on me and here goes. Oh, they're interested. But they're not landing. Well, I can feel them touching me and then they go away. Reporter: Not one bite with deet. Now for the picaridin spray. One bite, one lurker. That girl is showing. She's staying there for the long haul. And the second one is biting too. Oh, man. Reporter: In ten minutes I receive two bites wearing the picarid. N spray. That would be a low percentage, 1% biting you. Reporter: It rated the spray effective for seven hour, just an hour less than the deet sprays. And picaridin got much better results than true botanicals so if you're trying to wave off those pesky Skeeters without deet, picaridin may be your best bet. For ABC news, Becky Worley, ABC news.

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